*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
#app ul{
    width: 1287px;
    margin: auto;
    display: flex;
    flex-wrap: wrap;
}
#app ul li{
    width: 120px;
    height: 29px;
    padding: 6px 0 3px 0;
    margin-left: 23px;
    list-style: none;
}
#app ul li a{
    color: #333;
    text-decoration: none;
    display: inline-block;
}
#app ul li a img{
    width: 18px;
    height: 18px;
    vertical-align: bottom;
    margin-right: 5px;
}